: A late design revision changed resistor R7 to 510 ohms to increase sensitivity for low-impedance components like horizontal deflection coils.
The transformer winding is completely short-circuited or completely open. Tuning and Calibration Tips
+9V to +12V | +--------------+----------+----------+ | | | | [R1] [R2] [R3] [IC1] (555 Timer) | | | | +------[D1]----+----[C1]--+----------+ | | | | [Test] [Q1] [IC2] [LEDs] [Probe] (NPN) (LM311) (Ring Indicator) | | | | GND GND GND GND Use code with caution. Components List Timer (configured as an astable multivibrator). IC2: LM311cap L cap M 311
I have designed this to look like a high-value "share" within the electronics community.
Enter the Blue Ring Tester. This brilliant, low-cost device uses a pulse ringing test to identify shorted turns instantly. Today, we are providing an along with a component-level explanation of how it works. blue ring tester schematic diagram exclusive
: A high-quality inductor with low resistance will "ring" many times, producing a decaying AC waveform.
The classic AnaTek Blue Ring Tester schematic is built around a few inexpensive ICs. While I cannot redistribute the copyrighted PDF, I can describe the circuit block diagram in detail and point you to reliable sources for the full schematic.
: The tester uses pulses of approximately 600mV or less, allowing for many in-circuit tests without damaging sensitive semiconductor junctions.
The Ultimate Guide to the Blue Ring Tester: Schematic Diagram & Exclusive Insights : A late design revision changed resistor R7
Notes:
: When the test leads are shorted together, zero LEDs should light up. When connected across a known good flyback primary winding, all 8 to 10 LEDs (the full "blue ring") should illuminate brightly. How to Read the Test Results
If you want to construct this on a custom circuit board, I can provide a detailed netlist or suggest a optimized PCB layout strategy. Let me know if you would like me to:
The required components are few, easily available, and low-cost. Here's a typical bill of materials for a DIY project: This brilliant, low-cost device uses a pulse ringing
The , originally designed by Bob Parker and produced by AnaTek , is a specialized diagnostic tool used to test high-Q inductive components like flyback transformers, SMPS transformers, and deflection yokes. It works by injecting a low-voltage pulse into a coil and counting the subsequent "rings" or oscillations to determine its Quality Factor (Q) . Circuit Overview and Schematic Details
Causes the energy to dissipate rapidly, resulting in very few or no rings [1]. Exclusive Blue Ring Tester Schematic Diagram Analysis
If the coil is good, the ring lasts longer. The comparator detects how many cycles the oscillation amplitude remains above a certain threshold.